I've created an Excel spreadsheet and populated it with the specs on the Cape Dorys that I have the spec sheets for.
The spreadsheet uses the <a href="http://www.well.com/user/pk/YRAphrf-sf.html"'>Schell Regression Formula</a> to determine the BASE PHRF RATING for each model. In addition to that I am using the "<a href="http://www.phrfne.org/adj.htm">PHRF of New England Handicap Adjustments</a>" data to adjust the ratings.
By the way, the Base PHRF rating for a CD32 is 184, adjusted based on Realization's equipment, the rating for MY CD32 is 217.
Using the methods stated above, these are the <b>Base PHRF ratings</b> of the Cape Dory models for which I have specs.
CD22: 258
CD25D: 235
CD26: 235
CD27: 226
CD28: 216
CD300MS: 189
CD30C: 213
CD30K: 208
CD30MKII: 184
CD32: 184
CD33: 180
CD330: 170
CD36C: 174
Typhoon Daysailer: 293
Typhoon Senior: 240
Typhoon Weekender: 286
If your model CD is not on the list and you'd like to know the Base PHRF (and get the adjusted rating as well), send me the following data:
Boat Model
Displacement
Sail dimensions for I, P, PY, J, E, EY
LWL
Draft
And if you want the rating adjusted for your particular boat, then I need the following info:
Auxilliary Power--Propeller:
<BLOCKQUOTE>*Three bladed solid propeller in an aperture (ADD 3)
*Two bladed feathering propeller in an aperture (SUBTRACT 3)
*Three bladed feathering propeller in an aperture (NO CHANGE)
*Outboard fixed in well with two bladed solid propeller (ADD 6)</BLOCKQUOTE>
LP Adjustment (Headsail):
<BLOCKQUOTE>*152.1 - 160% (SUBTRACT 3)
*160.1 - 170% (SUBTRACT 6)
*Over 170% (SUBTRACT 9)
*Largest LP 135% or less (cruising canvas) (ADD 3)</BLOCKQUOTE>
Spinnaker Adjustment (Symmetrical with pole):
<BLOCKQUOTE>*Pole length and/or spinnaker width excess (2 inch tolerance) (SUBTRACT 3 per 10%)
*Spinnaker halyard height (ISP) greater than I (SUBTRACT 3 per 8% increase)</BLOCKQUOTE>
Recreational Adjustment:
<BLOCKQUOTE>*Limited inventory, jib roller furling, polyester and mylar only in working sails, no exotic sail materials such as kevlar, spectra, technora, etc. A maximum of: One nylon spinnaker; One jib with Lp > 110% ; One jib with Lp =< 110% (ADD 6)</BLOCKQUOTE>
Cruising Handicap (A staysail is allowed on a normal cutter rig. The cutter rig staysail must be used up wind. As only one headsail at a time may be flown by a sloop, a staysail shall not be flown by a sloop.):
<BLOCKQUOTE>*Normal masthead rig (ADD 12)
*Normal fractional rig (ADD 6)
*15/16s rig (I is greater than P, but not masthead) (ADD 9)
*Fractional rig with ISP greater than 1.01 times IM (ADD 9)
*LP 135% or less, but not if small jib standard (ADD 3)
*SPL > J but Whisker pole length = J (ADD 3)</BLOCKQUOTE>
Asymmetrical Spinnaker:
SL = average of SLU and SLE (Does not apply to boats where this spinnaker is standard.
Maximum width = 1.8 x JC (Does not apply to boats where this spinnaker is standard. Sport boats are handicapped with the largest class spinnaker.
Minimum mid girth, mid leech to closest luff point = .75 x max width
Boats that have an asymmetric spinnaker as standard will be handicapped in the class configuration. Variations from the class standard will have a handicap adjustment
<blockquote>*If part of standard boat configuration (ADD Zero)
*In addition to a symmetrical spinnaker (SUBTRACT 3)
*If only spinnaker on boat and flown from bow without pole or sprit. (This credit is lost if the spinnaker is used with a pole.) (ADD 9)
*If sprit added to conventional boat (SUBTRACT 3 per 10% J increase)</blockquote>
And other adjustments would need to be made if there have been changes to your boat's standard configuration, for example, different length mast or boom, changes to hull or ballast, interior modifications that remove original bulkheads, tables, doors, etc., mainsail roller furling.
Keep in mind that I am not an authority that can issue a certificate, but for CDSOA purposes, we can keep the ratings and the adjustments consistent.
Cathy
CD32 Realization, #3
Rahway, NJ
Raritan Bay
catherine_monaghanNOSPAM@merck.com
Base PHRF ratings and Adjustments for Cape Dorys
Moderator: Jim Walsh
-
Guest
Re: Base PHRF ratings and Adjustments for Cape Dorys
Good Luck, this formula was suggested in the past and not well received
Catherine Monaghan wrote: I've created an Excel spreadsheet and populated it with the specs on the Cape Dorys that I have the spec sheets for.
The spreadsheet uses the <a href="http://www.well.com/user/pk/YRAphrf-sf.html"'>Schell Regression Formula</a> to determine the BASE PHRF RATING for each model. In addition to that I am using the "<a href="http://www.phrfne.org/adj.htm">PHRF of New England Handicap Adjustments</a>" data to adjust the ratings.
By the way, the Base PHRF rating for a CD32 is 184, adjusted based on Realization's equipment, the rating for MY CD32 is 217.
Using the methods stated above, these are the <b>Base PHRF ratings</b> of the Cape Dory models for which I have specs.
CD22: 258
CD25D: 235
CD26: 235
CD27: 226
CD28: 216
CD300MS: 189
CD30C: 213
CD30K: 208
CD30MKII: 184
CD32: 184
CD33: 180
CD330: 170
CD36C: 174
Typhoon Daysailer: 293
Typhoon Senior: 240
Typhoon Weekender: 286
If your model CD is not on the list and you'd like to know the Base PHRF (and get the adjusted rating as well), send me the following data:
Boat Model
Displacement
Sail dimensions for I, P, PY, J, E, EY
LWL
Draft
And if you want the rating adjusted for your particular boat, then I need the following info:
Auxilliary Power--Propeller:
<BLOCKQUOTE>*Three bladed solid propeller in an aperture (ADD 3)
*Two bladed feathering propeller in an aperture (SUBTRACT 3)
*Three bladed feathering propeller in an aperture (NO CHANGE)
*Outboard fixed in well with two bladed solid propeller (ADD 6)</BLOCKQUOTE>
LP Adjustment (Headsail):
<BLOCKQUOTE>*152.1 - 160% (SUBTRACT 3)
*160.1 - 170% (SUBTRACT 6)
*Over 170% (SUBTRACT 9)
*Largest LP 135% or less (cruising canvas) (ADD 3)</BLOCKQUOTE>
Spinnaker Adjustment (Symmetrical with pole):
<BLOCKQUOTE>*Pole length and/or spinnaker width excess (2 inch tolerance) (SUBTRACT 3 per 10%)
*Spinnaker halyard height (ISP) greater than I (SUBTRACT 3 per 8% increase)</BLOCKQUOTE>
Recreational Adjustment:
<BLOCKQUOTE>*Limited inventory, jib roller furling, polyester and mylar only in working sails, no exotic sail materials such as kevlar, spectra, technora, etc. A maximum of: One nylon spinnaker; One jib with Lp > 110% ; One jib with Lp =< 110% (ADD 6)</BLOCKQUOTE>
Cruising Handicap (A staysail is allowed on a normal cutter rig. The cutter rig staysail must be used up wind. As only one headsail at a time may be flown by a sloop, a staysail shall not be flown by a sloop.):
<BLOCKQUOTE>*Normal masthead rig (ADD 12)
*Normal fractional rig (ADD 6)
*15/16s rig (I is greater than P, but not masthead) (ADD 9)
*Fractional rig with ISP greater than 1.01 times IM (ADD 9)
*LP 135% or less, but not if small jib standard (ADD 3)
*SPL > J but Whisker pole length = J (ADD 3)</BLOCKQUOTE>
Asymmetrical Spinnaker:
SL = average of SLU and SLE (Does not apply to boats where this spinnaker is standard.
Maximum width = 1.8 x JC (Does not apply to boats where this spinnaker is standard. Sport boats are handicapped with the largest class spinnaker.
Minimum mid girth, mid leech to closest luff point = .75 x max width
Boats that have an asymmetric spinnaker as standard will be handicapped in the class configuration. Variations from the class standard will have a handicap adjustment
<blockquote>*If part of standard boat configuration (ADD Zero)
*In addition to a symmetrical spinnaker (SUBTRACT 3)
*If only spinnaker on boat and flown from bow without pole or sprit. (This credit is lost if the spinnaker is used with a pole.) (ADD 9)
*If sprit added to conventional boat (SUBTRACT 3 per 10% J increase)</blockquote>
And other adjustments would need to be made if there have been changes to your boat's standard configuration, for example, different length mast or boom, changes to hull or ballast, interior modifications that remove original bulkheads, tables, doors, etc., mainsail roller furling.
Keep in mind that I am not an authority that can issue a certificate, but for CDSOA purposes, we can keep the ratings and the adjustments consistent.
Cathy
CD32 Realization, #3
Rahway, NJ
Raritan Bay
-
Mike Thorpe
What was the problem?? N/M
wrote: Good Luck, this formula was suggested in the past and not well received
Catherine Monaghan wrote: I've created an Excel spreadsheet and populated it with the specs on the Cape Dorys that I have the spec sheets for.
The spreadsheet uses the <a href="http://www.well.com/user/pk/YRAphrf-sf.html"'>Schell Regression Formula</a> to determine the BASE PHRF RATING for each model. In addition to that I am using the "<a href="http://www.phrfne.org/adj.htm">PHRF of New England Handicap Adjustments</a>" data to adjust the ratings.
By the way, the Base PHRF rating for a CD32 is 184, adjusted based on Realization's equipment, the rating for MY CD32 is 217.
Using the methods stated above, these are the <b>Base PHRF ratings</b> of the Cape Dory models for which I have specs.
CD22: 258
CD25D: 235
CD26: 235
CD27: 226
CD28: 216
CD300MS: 189
CD30C: 213
CD30K: 208
CD30MKII: 184
CD32: 184
CD33: 180
CD330: 170
CD36C: 174
Typhoon Daysailer: 293
Typhoon Senior: 240
Typhoon Weekender: 286
If your model CD is not on the list and you'd like to know the Base PHRF (and get the adjusted rating as well), send me the following data:
Boat Model
Displacement
Sail dimensions for I, P, PY, J, E, EY
LWL
Draft
And if you want the rating adjusted for your particular boat, then I need the following info:
Auxilliary Power--Propeller:
<BLOCKQUOTE>*Three bladed solid propeller in an aperture (ADD 3)
*Two bladed feathering propeller in an aperture (SUBTRACT 3)
*Three bladed feathering propeller in an aperture (NO CHANGE)
*Outboard fixed in well with two bladed solid propeller (ADD 6)</BLOCKQUOTE>
LP Adjustment (Headsail):
<BLOCKQUOTE>*152.1 - 160% (SUBTRACT 3)
*160.1 - 170% (SUBTRACT 6)
*Over 170% (SUBTRACT 9)
*Largest LP 135% or less (cruising canvas) (ADD 3)</BLOCKQUOTE>
Spinnaker Adjustment (Symmetrical with pole):
<BLOCKQUOTE>*Pole length and/or spinnaker width excess (2 inch tolerance) (SUBTRACT 3 per 10%)
*Spinnaker halyard height (ISP) greater than I (SUBTRACT 3 per 8% increase)</BLOCKQUOTE>
Recreational Adjustment:
<BLOCKQUOTE>*Limited inventory, jib roller furling, polyester and mylar only in working sails, no exotic sail materials such as kevlar, spectra, technora, etc. A maximum of: One nylon spinnaker; One jib with Lp > 110% ; One jib with Lp =< 110% (ADD 6)</BLOCKQUOTE>
Cruising Handicap (A staysail is allowed on a normal cutter rig. The cutter rig staysail must be used up wind. As only one headsail at a time may be flown by a sloop, a staysail shall not be flown by a sloop.):
<BLOCKQUOTE>*Normal masthead rig (ADD 12)
*Normal fractional rig (ADD 6)
*15/16s rig (I is greater than P, but not masthead) (ADD 9)
*Fractional rig with ISP greater than 1.01 times IM (ADD 9)
*LP 135% or less, but not if small jib standard (ADD 3)
*SPL > J but Whisker pole length = J (ADD 3)</BLOCKQUOTE>
Asymmetrical Spinnaker:
SL = average of SLU and SLE (Does not apply to boats where this spinnaker is standard.
Maximum width = 1.8 x JC (Does not apply to boats where this spinnaker is standard. Sport boats are handicapped with the largest class spinnaker.
Minimum mid girth, mid leech to closest luff point = .75 x max width
Boats that have an asymmetric spinnaker as standard will be handicapped in the class configuration. Variations from the class standard will have a handicap adjustment
<blockquote>*If part of standard boat configuration (ADD Zero)
*In addition to a symmetrical spinnaker (SUBTRACT 3)
*If only spinnaker on boat and flown from bow without pole or sprit. (This credit is lost if the spinnaker is used with a pole.) (ADD 9)
*If sprit added to conventional boat (SUBTRACT 3 per 10% J increase)</blockquote>
And other adjustments would need to be made if there have been changes to your boat's standard configuration, for example, different length mast or boom, changes to hull or ballast, interior modifications that remove original bulkheads, tables, doors, etc., mainsail roller furling.
Keep in mind that I am not an authority that can issue a certificate, but for CDSOA purposes, we can keep the ratings and the adjustments consistent.
Cathy
CD32 Realization, #3
Rahway, NJ
Raritan Bay
mthorpe@capecod.net
-
Catherine Monaghan
I can only guess, but...
Mike,
The previous poster didn't provide much info (no name or e-mail either) so I can only speculate that the use of the Schell Regression Formula wasn't well received by some (though it is now used by many yacht clubs) since it only provides a base PHRF. Anyway, that's why I am also using the "PHRF of New England Handicap Adjustments". The adjustments make a big difference as evidenced by the change in the rating for my own boat from a BASE PHRF rating of 184 to the adjusted rating of 217.
Anyway, if the CDSOA rates all of its members' boats using the same criteria, the ratings should be fair for all those participating in CDSOA events.
That's my two cents anyway.
Send me the particulars for Journey's End, and I'll provide her rating.
Cathy
catherine_monaghanNOSPAM@merck.com
The previous poster didn't provide much info (no name or e-mail either) so I can only speculate that the use of the Schell Regression Formula wasn't well received by some (though it is now used by many yacht clubs) since it only provides a base PHRF. Anyway, that's why I am also using the "PHRF of New England Handicap Adjustments". The adjustments make a big difference as evidenced by the change in the rating for my own boat from a BASE PHRF rating of 184 to the adjusted rating of 217.
Anyway, if the CDSOA rates all of its members' boats using the same criteria, the ratings should be fair for all those participating in CDSOA events.
That's my two cents anyway.
Send me the particulars for Journey's End, and I'll provide her rating.
Cathy
catherine_monaghanNOSPAM@merck.com
-
Mike Thorpe
Re: I can only guess, but...
Cathy,
I would guess that you are right and if everyone is using the same system what's the problem. The PHRF Handicap Adjustments are important to compensate for differn't equipment configurations.
I'll send you my particulars via Email. I may have my hands full with
a certain CD-33 on the Maine Cruise.
Mike
mthorpe@capecod.net
I would guess that you are right and if everyone is using the same system what's the problem. The PHRF Handicap Adjustments are important to compensate for differn't equipment configurations.
I'll send you my particulars via Email. I may have my hands full with
a certain CD-33 on the Maine Cruise.
Mike
Catherine Monaghan wrote: Mike,
The previous poster didn't provide much info (no name or e-mail either) so I can only speculate that the use of the Schell Regression Formula wasn't well received by some (though it is now used by many yacht clubs) since it only provides a base PHRF. Anyway, that's why I am also using the "PHRF of New England Handicap Adjustments". The adjustments make a big difference as evidenced by the change in the rating for my own boat from a BASE PHRF rating of 184 to the adjusted rating of 217.
Anyway, if the CDSOA rates all of its members' boats using the same criteria, the ratings should be fair for all those participating in CDSOA events.
That's my two cents anyway.
Send me the particulars for Journey's End, and I'll provide her rating.
Cathy
mthorpe@capecod.net